condition mean min max ZT0-3 1.7672842967500002 1.502346093 2.0322225005 ZT4-7 0.87940650075 0.769466936 0.9893460654999999 ZT8-11 2.791779589 0.9582574885 4.6253016895 ZT12-15 7.1707024555 6.7598059925000005 7.581598918499999 ZT16-19 6.94675781 6.5913319025 7.3021837175 ZT20-23 7.697206229 7.605629927999999 7.788782530000001